本文实例讲述了php实现的替换敏感字符串类及其用法,在php程序开发中有着非常广泛的应用价值。分享给大家供大家参考。具体方法如下:
StrFilter.class.php类文件如下:
<?php /** string filter class * Date: 2013-01-09 * Author: fdipzone * Ver: v1.0 * * Func: * public replace 替换非法字符 * public check 检查是否含有非法字符 * private protect_white_list 保护白名单 * private resume_white_list 还原白名单 * private getval 白名单 key转为value */ class StrFilter{ // class start private $_white_list = array(); private $_black_list = array(); private $_replacement = '*'; private $_LTAG = '[[##'; private $_RTAG = '##]]'; /** * @param Array $white_list * @param Array $black_list * @param String $replacement */ public function __construct($white_list=array(), $black_list=array(), $replacement='*'){ $this->_white_list = $white_list; $this->_black_list = $black_list; $this->_replacement = $replacement; } /** 替换非法字符 * @param String $content 要替換的字符串 * @return String 替換后的字符串 */ public function replace($content){ if(!isset($content) || $content==''){ return ''; } // protect white list $content = $this->protect_white_list($content); // replace black list if($this->_black_list){ foreach($this->_black_list as $val){ $content = str_replace($val, $this->_replacement, $content); } } // resume white list $content = $this->resume_white_list($content); return $content; } /** 检查是否含有非法自符 * @param String $content 字符串 * @return boolean */ public function check($content){ if(!isset($content) || $content==''){ return true; } // protect white list $content = $this->protect_white_list($content); // check if($this->_black_list){ foreach($this->_black_list as $val){ if(strstr($content, $val)!=''){ return false; } } } return true; } /** 保护白名单 * @param String $content 字符串 * @return String */ private function protect_white_list($content){ if($this->_white_list){ foreach($this->_white_list as $key=>$val){ $content = str_replace($val, $this->_LTAG.$key.$this->_RTAG, $content); } } return $content; } /** 还原白名单 * @param String $content * @return String */ private function resume_white_list($content){ if($this->_white_list){ $content = preg_replace_callback("/\[\[##(.*?)##\]\].*?/si", array($this, 'getval'), $content); } return $content; } /** 白名单 key还原为value * @param Array $matches 匹配white_list的key * @return String white_list val */ private function getval($matches){ return isset($this->_white_list[$matches[1]])? $this->_white_list[$matches[1]] : ''; // key->val } } // class end ?>
demo示例如下:
<?php header("content-type:text/html;charset=utf8"); require("StrFilter.class.php"); $white = array('屌丝', '曹操'); $black = array('屌', '操'); $content = "我操,曹操你是屌丝,我屌你啊"; $obj = new StrFilter($white, $black); echo $obj->replace($content); ?>
完整实例代码点击本站下载
希望本文所述对大家php程序设计的学习有所帮助。

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。


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